Income Taxes - Schedule of Calculation of the Effective Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ (1,171)		$ 9,555		$ (1,430)	$ 12,888
Income tax provision (benefit)	(946)		2,134		(841)	2,692
Net income (loss)	$ (225)	$ (364)	$ 7,421	$ 2,775	$ (589)	$ 10,196
Effective tax rate	81.00%		22.00%		59.00%	21.00%